All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
The numbers 11, 13, 17 and 19 are prime.
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
There are many ways to do prime factorisation for 20. It is not prime as it has more than 2 factors. The beginning of the prime factorisation is correct, but it is incomplete. These are two ways to complete it. 20 4x5 2x2x5 or 20 2x10 2x2x5 You have to continue using factorisation on all the numbers until all the numbers are prime. The prime numbers will always be the same if it starts with the same original number.
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
The first prime above 20 is 23, and then all others (29 is the next).
23,29,31,37,41,and 47
23 and 29
All of them except for 23 and 29 which are prime numbers.
2/5 of the numbers from 1 to 20 are prime numbers
23 29.
23 29 31 37.
They are 23 and 29.
11 13 17 19
The prime numbers between 10 and 20 are 11, 13, 17, and 19.
7 + 13 = 20 Note that there are no two prime numbers x and y that multiply to 20.